Thanks, I was missing windows messenger
I had other problem when using the MessengerAPI but I already solved it. You should include it in your tutorial:
http://shoutbox.menthix.net/showthread.php?tid=50578
When compiling a project using the MessengerAPI, it may give the error:
error CS1577: Assembly generation failed -- Referenced assembly 'Interop.MessengerAPI' does not have a strong name
To solve this the line in the AssemblyInfo.cs:
[assembly: AssemblyKeyFile("..\\..\\keyfile.snk")]
isn't enough, so, we have to go to:
- Project Properties > Common Properties > General > Wrapper Assembly Key File
and add our strong name key file:
keyfile.snk
/ 
